Work-table.



(No Model.)

B. S. YARNELL.

WORK TABLE.

(Application filed Mar. 27, 1901.)

Patented July 30, I9Ul.

2 Sheets-Sheet ll.

No. 679,354. Patented July 30, mm. c. s. YARNELL.

WORK TABLE.

(Application filed 1m. 27, 1901.

(No Model.) 2 Sheets-Sheet 2.

Smwbw. m [7M W UNITED STATES Arnnr CHARLES S. YARNELL, OF MINNEAPOLIS,MINNESOTA, ASSIGNOR TO MOORE CARVING MACHINE COMPANY, OF SAME PLACE.

WORK- -TABLE.

SPECIFICATION forming part of Letters Patent No. 679,354, dated July 30,1901. Application filed March 27, 1901. Serial No. 52,773. (No model.)

T at whom it may concern.-

Be it known that I, CHARLES S. YARNELL, residing at Minneapolis, in thecounty of Hennepin and State of Minnesota, have invented a new anduseful Improvement in WVork- Tables, of which the following is adescription, reference being had to the accompanying drawings, which area part of this specification.

to My invention relates to improved workholders, the mechanism in whichthe invention is embodied being especially adapted for holding roundtable-tops while their upper surface is being finished by abrading andpolishing, especially by means of a reciprocating polisher or buffer.The table-tops that my improved holder is particularly'adapted for arethe round wood tops of tables for household use.

The invention consists of the mechanism,

its parts, and combinations of parts, as herein described and claimed orthe equivalent thereof.

In the drawings, Figure 1 is a top plan view of a slatted bench or tablehaving my improved mechanism thereon for clamping and holding roundtable-tops or similar articles While being polished or otherwisefinished. Fig. 2 is a top plan view of one of the clamp- 0 ing members.Fig. 3 is a vertical section of the same clamping member shown in Fig. 2on line 3 3 thereof looking toward the right, the section resting on afragment of the worksupporting table. Fig. 4. is an edge view of oneoftheclampingmembersrestingonafragment of the work-table, which is shownin section. Fig. 5 is a vertical section of the clamping member shown inFig. 2 on line 5 5 thereof in connection with a fragment of a table-topshown in such relation thereto as the tabletop has when it is inposition to be clamped in place for being polished. Fig. 6 is a verticalsection of my improved mechanism in connection with a fragment of atable-top 5 therewith, the view being substantially like the View shownin Fig. 5, except that the table-supporting device in Fig. 6 is inmodified form.

In the drawings I show the top 1 of a worktable, which is advisablycomposed of trans verse slats, though this is not material to myinvention. Two parallel longitudinally-disposed rails 2 2 rest movablyon the top of the work-table opposite each other, and these rails areprovided with a series of pin-holes 3 3, the pin-holes being advisablyat equal distance apart and registering with each other in the tworails. These rails are also advisably strengthened by truss-rods 4 4.Reversely threaded screws 5 5, rotatable without endwise movement inboxes therefor fixed on the work-supporting table, are disposed at rightangles to the rails 2 2 at distances apart and advisably near the endsof the rails 2 2 and turn by their threadsin nuts therefor fixed in therails 2 2. These screws are each provided with sprocket-wheels and areconnected together by an endless sprocketchain 6. For rotating thesescrews they may be faced at one extremity, as shown at 7, and acrank-handle 8 is employed to rotate the screws. It will be noted thatthe construction is such that by rotating either screw by means of thehandle 8 both screws are homogeneously rotated, and thereby the rails 22 are concurrently and homogeneously moved toward or from each other.

In connection with the rails2 2 four clamping members 9 9 are employed.These clamp ing members are conveniently constructed with a metal frame10 and a top 11, that may be of wood or metal, but is advisably of woodand may be covered, if desired, with sheet metal, preferably brass,though as such cov ering is not usually required it is not shown in thedrawings. The top 11 is secured to the frame 10 conveniently by means ofscrews 12 12. The frame 10 may be made in part secured together byscrews, as shown in the drawings, or may be made integral, if preferred.The general form of each of these four clamping members is that of atriangle, though the long edge of the top 11 is preferably curved toadapt it to the form of the edge of a table being held in place thereby.5 It should, however, be understood that the table being held in placeneed not be one that has a curve conforming to the curve of the top ofthe clamping member, as tables having a greater or less curve are heldin place with equal facility and security. These four clamping membersare arranged on the ner shown in Figs. and 6.

Work-table in pairs opposite each other at the inner edges of the rails2 2, the frames being each provided with a flange 13, that fits upon thetop surface of a rail 2, and a pin 14 is inserted through a hole in theflange 13 and into any one of the pin-holes 3 in a rail 2 that isdesired. It will be seen that by this arrangement there is providedbetween the four clamping members 9 9 an approximately circular opening,into which a round table-top may be placed to be clamped by theseclamping members when drawn thereto.

The frames 10 are provided with fingers or knobs in flattened form andhaving rounded terminal edges, which knobs project beyond the edge ofthe top 11 and are adapted to bear against the frame A of the table,being supported on the work-table in the man- The bearing edges of theknobs 15 are advisably covered with a cushion 16, of leather or othersuitable material. I preferably employ a plurality-two or moreof knobsof this character on each clamping member 9. For supporting thetable-top to be polished on these clamping members and in such manner asto be adjustable vertically I employ verticallyadjustabl'e supportingdevices consisting of bolts 17 17, which are conveniently supportedloosely in the frame 10, through which they pass in suitable aperturesor boxes therefor. These bolts are preferably located in the frame atthesame places as the knobs 15, the enlargements or extensions of the framefor constructing these knobs providing convenient means for supportingthese bolts at those localities. These bolts 17 have overturned tops,the upper surfaces of which are adapted to receive thereon the top B ofthe table to be polished, and the free leg of the bolt may bear againstthe frameA of the table, though this is not a necessity. For supportingand adjusting these bolts vertically they are provided withscrew-threads, on which nuts 18 are employed, which nuts are placed inbearings therefor in the frame 10, preventing endwise movement of thenuts, whereby by the rotation of the nuts the bolts are raised and bolts17. Thereupon the bolts 17 are adjustlowered.

In the modified form shown in Fig. 6, in which a table is shown having atop B- that does not project beyond the frame A, I employ a modifiedform of bolt 17, in which the overturned end of the bolt is extendeddownwardly and turned laterally, so as to pass under the lower edge ofthe frame A of the table, and thereby support the table instead ofhaving its top rest on the bolt, as shown in the form illustrated inFig. 5.

, From the drawings and the foregoing de-' scription it will beunderstood that in use the rails 2 and the members 9 9 are first soadjusted that a round-top table can be easily, but with as little playaspossible, let down within the circle of the members 9 9 onto the ed tobring the table to the proper height for finishing, and then the screws5 5 are rotated, moving the rails 2 2 toward each other, whereby thetable-top is clamped by the clamping members in secure position forbeing polished or otherwise finished.

What I claim as my invention is 1. In combination in a work-table, aworktable frame or top, rails resting movably on said frame or top,reversely-threaded screws mounted rotatably in the work-table frame ortop and turning in said rails adapted to adjust the rails toward andfrom each other, and clamping members secured movably to and adjustablewith and on said rails above the top of the work-table, the clampingmembers being so shaped and arranged as to form complementary members ofa work-holding device, each member being substantially triangular inform and provided with thereonmounted supporting and clamping devicesadapted to clamp and hold the work above the table and within andbetween the clampin g members and substantially flush with the topsurface thereof.

2. In combination in a work-table, a fixed supporting means, a pair ofrails adjustable toward and from each other on the supporting means,reversely-threaded screws rotatable in the supporting means and turningby their threads in the rails, clamping members in a generallytriangular form in opposite pairs adjustable on and along said rails,means securing the clamping members releasably to the rails, knobsprojecting from the clamping members at their long edges, and means inthe clamping members adjustable transversely thereof for supporting thearticle held thereby at a suitable height with referencethereto.

3. In clamping mechanism in a work-table, a clamping member insubstantially triangular form, and knobs at a distance apart projectinginwardly from the long edge or hypotenuse of the clamping member belowits top surface and adapted to receive the work against them and hold itbetween the clamping members and substantially flush therewith above thetable.

at. In clamping mechanism in a Work-table, a clamping member insubstantially triangular form, a pluralityof knobs projecting from thelong edge of the clamping member, and adapted to receive against themthe article to be held, bolts movable endwise at a right angle to thedirection of the projection of the knobs, and nuts turning on the boltsbut held in the clamping member against endwise movement.

In testimony whereof I affix my signature in presence of two witnesses.

.OHARLES S. YARNELL.

Witnesses:

E. A. FORCE, GEO. M. J ONES.

